/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.android.apis.graphics;

import android.content.Context;
import android.graphics.*;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.*;

public class Patterns extends GraphicsActivity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(new SampleView(this));
	}

	private static Bitmap makeBitmap1() {
		Bitmap bm = Bitmap.createBitmap(40, 40, Bitmap.Config.RGB_565);
		Canvas c = new Canvas(bm);
		c.drawColor(Color.RED);
		Paint p = new Paint();
		p.setColor(Color.BLUE);
		c.drawRect(5, 5, 35, 35, p);
		return bm;
	}

	private static Bitmap makeBitmap2() {
		Bitmap bm = Bitmap.createBitmap(64, 64, Bitmap.Config.ARGB_8888);
		Canvas c = new Canvas(bm);
		Paint p = new Paint(Paint.ANTI_ALIAS_FLAG);
		p.setColor(Color.GREEN);
		p.setAlpha(0xCC);
		c.drawCircle(32, 32, 27, p);
		return bm;
	}

	private static class SampleView extends View {
		private final Shader mShader1;
		private final Shader mShader2;
		private final Paint mPaint;
		private final DrawFilter mFastDF;

		private float mTouchStartX;
		private float mTouchStartY;
		private float mTouchCurrX;
		private float mTouchCurrY;
		private DrawFilter mDF;

		public SampleView(Context context) {
			super(context);
			setFocusable(true);
			setFocusableInTouchMode(true);

			mFastDF = new PaintFlagsDrawFilter(Paint.FILTER_BITMAP_FLAG
					| Paint.DITHER_FLAG, 0);

			mShader1 = new BitmapShader(makeBitmap1(), Shader.TileMode.REPEAT,
					Shader.TileMode.REPEAT);
			mShader2 = new BitmapShader(makeBitmap2(), Shader.TileMode.REPEAT,
					Shader.TileMode.REPEAT);

			Matrix m = new Matrix();
			m.setRotate(30);
			mShader2.setLocalMatrix(m);

			mPaint = new Paint(Paint.FILTER_BITMAP_FLAG);
		}

		@Override
		protected void onDraw(Canvas canvas) {
			canvas.setDrawFilter(mDF);

			mPaint.setShader(mShader1);
			canvas.drawPaint(mPaint);

			canvas.translate(mTouchCurrX - mTouchStartX, mTouchCurrY
					- mTouchStartY);

			mPaint.setShader(mShader2);
			canvas.drawPaint(mPaint);
		}

		@Override
		public boolean onTouchEvent(MotionEvent event) {
			float x = event.getX();
			float y = event.getY();

			switch (event.getAction()) {
			case MotionEvent.ACTION_DOWN:
				mTouchStartX = mTouchCurrX = x;
				mTouchStartY = mTouchCurrY = y;
				mDF = mFastDF;
				invalidate();
				break;
			case MotionEvent.ACTION_MOVE:
				mTouchCurrX = x;
				mTouchCurrY = y;
				invalidate();
				break;
			case MotionEvent.ACTION_UP:
				mDF = null;
				invalidate();
				break;
			}
			return true;
		}
	}
}
